WIP
convert existing histories to content type
fix flake error
after review
after review
updated changelog
after quamilek review
after review
added history documentation
changed history doc
small changes
added migration
Merge pull request #434 from ar4s/feature/177-history-on-content-type

History on content type
merge + fixes
travis: ralph from develop
Merge pull request #442 from xliiv/synergy-clean

merged synergy into develop
Merge branch 'develop' into search-synergy-fields